Find X

Find X, such that

sum(digits(X,2)) = 6
sum(digits(X,10)) = 6
sum(digits(X,40)) = 6

>>6
transistors use 2
chmod uses 3
hexeditor uses 16
D'ni uses 25 (http://www.omniglot.com/writing/dni.htm)
Ancient Sumerians used 60

so just die please.

>>8
now do it in JavaScript.